361888921 has 2 divisors, whose sum is σ = 361888922. Its totient is φ = 361888920.

The previous prime is 361888889. The next prime is 361888931. The reversal of 361888921 is 129888163.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361190025 + 698896 = 19005^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 361888921 - 2⁵ = 361888889 is a prime.

It is a super-2 number, since 2×361888921² = 261927182285088482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (361888931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180944460 + 180944461.

It is an arithmetic number, because the mean of its divisors is an integer number (180944461).

Almost surely, 2^361888921 is an apocalyptic number.

It is an amenable number.

361888921 is a deficient number, since it is larger than the sum of its proper divisors (1).

361888921 is an equidigital number, since it uses as much as digits as its factorization.

361888921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 46.

The square root of 361888921 is about 19023.3782751645. The cubic root of 361888921 is about 712.6206930455.

The spelling of 361888921 in words is "three hundred sixty-one million, eight hundred eighty-eight thousand, nine hundred twenty-one".